Cheap Displacement Measurement Sensors


Thread Starter


I'm looking for a displacement measurement sensor with a range of about 200~300mm and a resolution of 0.2~0.3mm.

The sensing object is a knitted fabric & the output of the sensor should be either 4-20mA or 0-10V.

There are plenty of sensors that use the laser triangulation method, but they are extremely expensive (> 1500 USD). Does anyone know a cheaper (< 1000 USD) alternative that may fit those requirements?


Have you looked at ultrasonic sensors? Not sure what sort of resolutions they can get, but they start at $100 for the cheap ones.